Zero magnetostrictive amorphous alloys with high permeability and high magnetic induction

Abstract

The rapidly quenched zero magnetostrictive Co-Fe-Si-B amorphous alloys having high magnetic induction and high permeability have been studied. The magnetic annealing under the vertical magnetic field H⊥ and under the rotating magnetic field Hφ has been investigated to obtain high permeability even though the alloys have the Curie temperature Tc higher than the crystallization temperature Tx. A zero magnetostrictive amorphous alloy with saturation magnetization σs = 115 e.m.u./gr and with initial permeability μi = 8,000 at 1 kHz has been obtained using the new method of magnetic annealing.